(19)

(11)

EP 0 554 394 A1

(12)

(43) Date of publication: 11.08.1993 Bulletin 1993/32 (21) Application number: 92900096.0 (22) Date of filing: 07.10.1991

(51) International Patent Classification (IPC):  G05D 1/ 02( . ) (86) International application number: PCT/US1991/007424 (87) International publication number: WO 1992/008176 (14.05.1992 Gazette 1992/11)

(84) Designated Contracting States: AT CH DE ES FR GB IT LI SE (30) Priority: 24.10.1990 US 19900602609 (71) Applicant: EATON-KENWAY, INC. Salt Lake City Utah 84102 (US)	(72) Inventors: BLOOMFIELD, Bryan, Alexander Bountiful, UT 84010 (US) WHATCOTT, Gary, Lavell Salt Lake City, UT 84117 (US) YARDLEY, James, V. Centerville, UT 84014 (US) (74) Representative: Douglas, John Andrew  Eaton House Staines Road Hounslow Middlesex TW4 5DX Hounslow Middlesex TW4 5DX (GB)